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- W2034996763 abstract "PURPOSE A number of techniques, which measure a variety of physiological parameters, have been proposed for identifying the threshold of fatigue during cycle ergometry. The purpose of the present study was to propose a new test to determine the physical working capacity at the oxygen consumption threshold (PWCVO2), and to compare it to other fatigue thresholds determined from the measurement of heart rate (the physical working capacity at the heart rate threshold; PWCHRT), and muscle activation (the electromyographic fatigue threshold; EMGFT). METHODS Nineteen adult volunteers (mean age ± SD= 22 ± 2 years) performed an incremental (30 W increase every 2 minutes) test to exhaustion on an electronically braked ergometer for the determination of VO2peak. Standard open circuit spirometry (Parvo Medics metabolic cart) was used to collect and analyze expired gas samples. The subjects also performed four randomly ordered eight-minute workbouts at different power outputs (ranging from 65 to 320 W) for the determination of PWCHRT, EMGFT, and PWCVO2. Heart rate values were monitored using a Polar Heart Watch System and EMG data were collected using a bipolar surface electrode arrangement on the vastus lateralis muscle. RESULTS A one-way repeated measure ANOVA with Tukey post-hoc comparison indicated that PWCHRT (mean ± SD = 93± 45 W; 37± 7% of VO2peak) was significantly less (p < 0.05) than EMGFT (137±54 W; 54± 8% of VO2peak), but there were no differences for PWCVO2(120± 45 W, 48± 8% of VO2peak) versus PWCHRT or EMGFT. CONCLUSIONS The results of this study indicated that there are differences among fatigue thresholds determined from heart rate and EMG measurements, and that the mathematical model used to estimate PWCHRT and EMGFT can be applied to oxygen consumption to determine PWCVO2 during cycle ergometry. These findings suggested an integration among central and peripheral factors with regard to the onset of fatigue during cycle ergometry." @default.
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- W2034996763 date "2003-05-01" @default.
- W2034996763 modified "2023-10-18" @default.
- W2034996763 title "A PROPOSED TEST FOR DETERMINING PHYISCAL WORKING CAPACITY AT THE OXYGEN COMSUMPTION THRESHOLD" @default.
- W2034996763 doi "https://doi.org/10.1097/00005768-200305001-01523" @default.
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